I am writing to express my deep sadness regarding the recent changes to O1 Pro. The application no longer facilitates deep thinking and instead provides simple responses, which has severely impacted my ultimate productivity. I have attempted several times to locate the familiar “Details” button and the comprehensive thinking process interface, but have been unsuccessful. This regression is disheartening as O1 Pro was an essential tool in my daily operations. I kindly request your assistance in restoring these critical features or providing guidance on how to regain the application’s previous capabilities.